---
sidebar_position: 3
---

# Options

## Application Options

The `Options.App` struct contains the application configuration.
It is passed to the `wails.Run()` method:

```go title="Example"
import (
    "github.com/wailsapp/wails/v2/pkg/options"
    "github.com/wailsapp/wails/v2/pkg/options/assetserver"
    "github.com/wailsapp/wails/v2/pkg/options/linux"
    "github.com/wailsapp/wails/v2/pkg/options/mac"
    "github.com/wailsapp/wails/v2/pkg/options/windows"
)

func main() {

    err := wails.Run(&options.App{
        Title:              "Menus Demo",
        Width:              800,
        Height:             600,
        DisableResize:      false,
        Fullscreen:         false,
        WindowStartState:   options.Maximised,
        Frameless:          true,
        MinWidth:           400,
        MinHeight:          400,
        MaxWidth:           1280,
        MaxHeight:          1024,
        StartHidden:        false,
        HideWindowOnClose:  false,
        BackgroundColour:   &options.RGBA{R: 0, G: 0, B: 0, A: 255},
        AlwaysOnTop:        false,
        AssetServer: &assetserver.Options{
            Assets:     assets,
            Handler:    assetsHandler,
            Middleware: assetsMidldeware,
		},
        Menu:               app.applicationMenu(),
        Logger:             nil,
        LogLevel:           logger.DEBUG,
        LogLevelProduction: logger.ERROR,
        OnStartup:          app.startup,
        OnDomReady:         app.domready,
        OnShutdown:         app.shutdown,
        OnBeforeClose:      app.beforeClose,
        CSSDragProperty:   "--wails-draggable",
        CSSDragValue:      "drag",
        EnableDefaultContextMenu: false,
        EnableFraudulentWebsiteDetection: false,
        Bind: []interface{}{
            app,
        },
        EnumBind: []interface{}{
            AllWeekdays,
        },
        ErrorFormatter: func(err error) any { return err.Error() },
        SingleInstanceLock: &options.SingleInstanceLock{
          UniqueId:               "c9c8fd93-6758-4144-87d1-34bdb0a8bd60",
          OnSecondInstanceLaunch: app.onSecondInstanceLaunch,
        },
        DragAndDrop: &options.DragAndDrop{
          EnableFileDrop:       false,
          DisableWebViewDrop:   false,
          CSSDropProperty:      "--wails-drop-target",
          CSSDropValue:         "drop",
        },
        Windows: &windows.Options{
            WebviewIsTransparent:              false,
            WindowIsTranslucent:               false,
            BackdropType:                      windows.Mica,
            DisablePinchZoom:               false,
            DisableWindowIcon:                 false,
            DisableFramelessWindowDecorations: false,
            WebviewUserDataPath:               "",
            WebviewBrowserPath:                "",
            Theme:                             windows.SystemDefault,
            CustomTheme: &windows.ThemeSettings{
                DarkModeTitleBar:   windows.RGB(20, 20, 20),
                DarkModeTitleText:  windows.RGB(200, 200, 200),
                DarkModeBorder:     windows.RGB(20, 0, 20),
                LightModeTitleBar:  windows.RGB(200, 200, 200),
                LightModeTitleText: windows.RGB(20, 20, 20),
                LightModeBorder:    windows.RGB(200, 200, 200),
            },
            // ZoomFactor is the zoom factor for the WebView2. This is the option matching the Edge user activated zoom in or out.
            ZoomFactor:           float64,
            // IsZoomControlEnabled enables the zoom factor to be changed by the user.
            IsZoomControlEnabled: bool,
            // User messages that can be customised
            Messages: *windows.Messages
            // OnSuspend is called when Windows enters low power mode
            OnSuspend: func()
            // OnResume is called when Windows resumes from low power mode
            OnResume: func(),
            // Disable GPU hardware acceleration for the webview
			      WebviewGpuDisabled: false,
			      // Class name for the window. If empty, 'wailsWindow' will be used.
			      WindowClassName: "MyWindow",
        },
        Mac: &mac.Options{
            TitleBar: &mac.TitleBar{
                TitlebarAppearsTransparent: true,
                HideTitle:                  false,
                HideTitleBar:               false,
                FullSizeContent:            false,
                UseToolbar:                 false,
                HideToolbarSeparator:       true,
                OnFileOpen: app.onFileOpen,
			          OnUrlOpen:  app.onUrlOpen,
            },
			Appearance:           mac.NSAppearanceNameDarkAqua,
            WebviewIsTransparent: true,
            WindowIsTranslucent:  false,
            About: &mac.AboutInfo{
                Title:   "My Application",
                Message: "© 2021 Me",
                Icon:    icon,
            },
        },
        Linux: &linux.Options{
            Icon: icon,
            WindowIsTranslucent: false,
            WebviewGpuPolicy: linux.WebviewGpuPolicyNever,
            ProgramName: "wails"
        },
        Debug: options.Debug{
            OpenInspectorOnStartup: false,
        },
    })

    if err != nil {
        log.Fatal(err)
    }
}

```

### Title

The text shown in the window's title bar.

Name: Title<br/>
Type: `string`

### Width

The initial width of the window.

Name: Width<br/>
Type: `int`<br/>
Default: 1024.

### Height

The initial height of the window.

Name: Height<br/>
Type: `int`<br/>
Default: 768

### DisableResize

By default, the main window is resizable. Setting this to `true` will keep it a fixed size.

Name: DisableResize<br/>
Type: `bool`

### Fullscreen

Deprecated: Please use [WindowStartState](#windowstartstate).

### WindowStartState

Defines how the window should present itself at startup.

| Value      | Win | Mac | Lin |
| ---------- | --- | --- | --- |
| Fullscreen | ✅  | ✅  | ✅  |
| Maximised  | ✅  | ✅  | ✅  |
| Minimised  | ✅  | ❌  | ✅  |

Name: WindowStartState<br/>
Type: `options.WindowStartState`

### Frameless

When set to `true`, the window will have no borders or title bar.
Also see [Frameless Windows](../guides/frameless.mdx).

Name: Frameless<br/>
Type: `bool`

### MinWidth

This sets the minimum width for the window. If the value given in `Width` is less than this value,
the window will be set to `MinWidth` by default.

Name: MinWidth<br/>
Type: `int`

### MinHeight

This sets the minimum height for the window. If the value given in `Height` is less than this value,
the window will be set to `MinHeight` by default.

Name: MinHeight<br/>
Type: `int`

### MaxWidth

This sets the maximum width for the window. If the value given in `Width` is more than this value,
the window will be set to `MaxWidth` by default.

Name: MaxWidth<br/>
Type: `int`

### MaxHeight

This sets the maximum height for the window. If the value given in `Height` is more than this value,
the window will be set to `MaxHeight` by default.

Name: MaxHeight<br/>
Type: `int`

### StartHidden

When set to `true`, the application will be hidden until [WindowShow](../reference/runtime/window.mdx#windowshow)
is called.

Name: StartHidden<br/>
Type: `bool`

### HideWindowOnClose

By default, closing the window will close the application. Setting this to `true` means closing the window will

hide the window instead.

Name: HideWindowOnClose<br/>
Type: `bool`

### BackgroundColour

This value is the default background colour of the window.
Example: options.NewRGBA(255,0,0,128) - Red at 50% transparency

Name: BackgroundColour<br/>
Type: `*options.RGBA`<br/>
Default: white

### AlwaysOnTop

Indicates that the window should stay above other windows when losing focus.

Name: AlwaysOnTop<br/>
Type: `bool`

### Assets

Deprecated: Please use Assets on [AssetServer specific options](#assetserver).

### AssetsHandler

Deprecated: Please use AssetsHandler on [AssetServer specific options](#assetserver).

### AssetServer

This defines AssetServer specific options. It allows to customize the AssetServer with static assets, serving assets
dynamically with an `http.Handler` or hook into the request chain with an `assetserver.Middleware`.

Not all features of an `http.Request` are currently supported, please see the following feature matrix:

| Feature                 | Win | Mac | Lin    |
| ----------------------- | --- | --- | ------ |
| GET                     | ✅  | ✅  | ✅      |
| POST                    | ✅  | ✅  | ✅ [^1] |
| PUT                     | ✅  | ✅  | ✅ [^1] |
| PATCH                   | ✅  | ✅  | ✅ [^1] |
| DELETE                  | ✅  | ✅  | ✅ [^1] |
| Request Headers         | ✅  | ✅  | ✅ [^1] |
| Request Body            | ✅  | ✅  | ✅ [^2] |
| Request Body Streaming  | ✅  | ✅  | ✅ [^2] |
| Response StatusCodes    | ✅  | ✅  | ✅ [^1] |
| Response Headers        | ✅  | ✅  | ✅ [^1] |
| Response Body           | ✅  | ✅  | ✅      |
| Response Body Streaming | ❌  | ✅  | ✅      |
| WebSockets              | ❌  | ❌  | ❌      |
| HTTP Redirects 30x      | ✅  | ❌  | ❌      |

[^1]: This requires WebKit2GTK 2.36+ support and your app needs to be build with the build tag `webkit2_36` to activate support for this feature. This also bumps the minimum requirement of WebKit2GTK to 2.36 for your app.
[^2]: This requires WebKit2GTK 2.40+ support and your app needs to be build with the build tag `webkit2_40` to activate support for this feature. This also bumps the minimum requirement of WebKit2GTK to 2.40 for your app.

Name: AssetServer<br/>
Type: `*assetserver.Options`

#### Assets

The static frontend assets to be used by the application.

A GET request is first tried to be served from this `fs.FS`. If the `fs.FS` returns `os.ErrNotExist` for that file,
the request handling will fallback to the [Handler](#handler) and tries to serve the GET request from it.

If set to nil, all GET requests will be forwarded to [Handler](#handler).

Name: Assets<br/>
Type: `fs.FS`

#### Handler

The assets handler is a generic `http.Handler` for fallback handling of assets that can't be found.

The handler will be called for every GET request that can't be served from [Assets](#assets), due to `os.ErrNotExist`.
Furthermore all non GET requests will always be served from this Handler.
If not defined, the result is the following in cases where the Handler would have been called:

- GET request: `http.StatusNotFound`
- Other request: `http.StatusMethodNotAllowed`

:::info

This does not work with vite v5.0.0+ and wails v2 due to changes in vite.
Changes are planned in v3 to support similar functionality under vite v5.0.0+.
If you need this feature, stay with vite v4.0.0+.
See [issue 3240](https://github.com/wailsapp/wails/issues/3240) for details

:::

NOTE: When used in combination with a Frontend DevServer there might be limitations, eg. Vite serves the index.html
on every path, that does not contain a file extension.

Name: AssetsHandler<br/>
Type: `http.Handler`

#### Middleware

Middleware is a HTTP Middleware which allows to hook into the AssetServer request chain. It allows to skip the default
request handler dynamically, e.g. implement specialized Routing etc.
The Middleware is called to build a new `http.Handler` used by the AssetSever and it also receives the default
handler used by the AssetServer as an argument.

If not defined, the default AssetServer request chain is executed.

Name: Middleware<br/>
Type: `assetserver.Middleware`

### Menu

The menu to be used by the application. More details about Menus in the [Menu Reference](../reference/runtime/menu.mdx).

:::note

On Mac, if no menu is specified, a default menu will be created.

:::

Name: Menu<br/>
Type: `*menu.Menu`

### Logger

The logger to be used by the application. More details about logging in the [Log Reference](../reference/runtime/log.mdx).

Name: Logger<br/>
Type: `logger.Logger`<br/>
Default: Logs to Stdout

### LogLevel

The default log level. More details about logging in the [Log Reference](../reference/runtime/log.mdx).

Name: LogLevel<br/>
Type: `logger.LogLevel`<br/>
Default: `Info` in dev mode, `Error` in production mode

### LogLevelProduction

The default log level for production builds. More details about logging in the [Log Reference](../reference/runtime/log.mdx).

Name: LogLevelProduction<br/>
Type: `logger.LogLevel`<br/>
Default: `Error`

### OnStartup

This callback is called after the frontend has been created, but before `index.html` has been loaded. It is given
the application context.

Name: OnStartup<br/>
Type: `func(ctx context.Context)`

### OnDomReady

This callback is called after the frontend has loaded `index.html` and its resources. It is given
the application context.

Name: OnDomReady<br/>
Type: `func(ctx context.Context)`

### OnShutdown

This callback is called after the frontend has been destroyed, just before the application terminates. It is given
the application context.

Name: OnShutdown<br/>
Type: `func(ctx context.Context)`

### OnBeforeClose

If this callback is set, it will be called when the application is about to quit, either by clicking the window close
button or calling `runtime.Quit`. Returning true will cause the application to continue, false will continue shutdown
as normal. This is good for confirming with the user that they wish to exit the program.

Example:

```go title=windowsapp.go
func (b *App) beforeClose(ctx context.Context) (prevent bool) {
    dialog, err := runtime.MessageDialog(ctx, runtime.MessageDialogOptions{
        Type:          runtime.QuestionDialog,
        Title:         "Quit?",
        Message:       "Are you sure you want to quit?",
    })

    if err != nil {
        return false
    }
    return dialog != "Yes"
}
```

Name: OnBeforeClose<br/>
Type: `func(ctx context.Context) bool`

### CSSDragProperty

Indicates the CSS property to use to identify which elements can be used to drag the window. Default: `--wails-draggable`.

Name: CSSDragProperty<br/>
Type: `string`

### CSSDragValue

Indicates what value the `CSSDragProperty` style should have to drag the window. Default: `drag`.

Name: CSSDragValue<br/>
Type: `string`

### EnableDefaultContextMenu

EnableDefaultContextMenu enables the browser's default context-menu in production.

By default, the browser's default context-menu is only available in development and in a `-debug` [build](../reference/cli.mdx#build) along with the devtools inspector, Using this option you can enable the default context-menu in `production` while the devtools inspector won't be available unless the `-devtools` build flag is used.

When this option is enabled, by default the context-menu will only be shown for text contexts (where Cut/Copy/Paste is needed), to override this behavior, you can use the CSS property `--default-contextmenu` on any HTML element (including the `body`) with the following values :

| CSS Style                      | Behavior                                                                                                                                           |
|--------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------|
| `--default-contextmenu: auto;` | (**default**) will show the default context menu only if :<br/> contentEditable is true OR text has been selected OR element is input or textarea  |
| `--default-contextmenu: show;` | will always show the default context menu                                                                                                          |
| `--default-contextmenu: hide;` | will always hide the default context menu                                                                                                          |

This rule is inherited like any normal CSS rule, so nesting works as expected.

:::note
This filtering functionality is only enabled in production, so in development and in debug build, the full context-menu is always available everywhere.
:::

:::warning
This filtering functionality is NOT a security measure, the developer should expect that the full context-menu could be leaked anytime which could contain commands like (Download image, Reload, Save webpage), if this is a concern, the developer SHOULD NOT enable the default context-menu.
:::


Name: EnableDefaultContextMenu<br/>
Type: `bool`

### EnableFraudulentWebsiteDetection

EnableFraudulentWebsiteDetection enables scan services for fraudulent content, such as malware or phishing attempts.
These services might send information from your app like URLs navigated to and possibly other content to cloud
services of Apple and Microsoft.

Name: EnableFraudulentWebsiteDetection<br/>
Type: `bool`

### Bind

A slice of struct instances defining methods that need to be bound to the frontend.

Name: Bind<br/>
Type: `[]interface{}`

### EnumBind

A slice of Enum arrays that need to be bound to the frontend.

Name: EnumBind<br/>
Type: `[]interface{}`

### ErrorFormatter

A function that determines how errors are formatted when returned by a JS-to-Go
method call. The returned value will be marshalled as JSON.

Name: ErrorFormatter<br/>
Type: `func (error) any`

### SingleInstanceLock

Enables single instance locking. This means that only one instance of your application can be running at a time.

Name: SingleInstanceLock<br/>
Type: `*options.SingleInstanceLock`

#### UniqueId

This id is used to generate the mutex name on Windows and macOS and the dbus name on Linux. Use a UUID to ensure that the id is unique.

Name: UniqueId<br/>
Type: `string`

#### OnSecondInstanceLaunch

Callback that is called when a second instance of your app is launched.

Name: OnSecondInstanceLaunch<br/>
Type: `func(secondInstanceData SecondInstanceData)`

### Drag and Drop

Defines the behavior of drag and drop events on the window.

Name: DragAndDrop<br/>
Type: `options.DragAndDrop`

#### EnableFileDrop

EnableFileDrop enables wails' drag and drop functionality that returns the dropped in files' absolute paths.

When it is set to `true` the [runtime methods](../reference/runtime/draganddrop.mdx) can be used. <br/>
Or you can listen for the `wails:file-drop` event with [runtime EventsOn method](../reference/runtime/events.mdx#eventson) both on the
Javascript and GO side to implement any functionality you would like.

The event returns the coordinates of the drop and a file path slice.

Name: EnableFileDrop<br/>
Type: `bool`<br/>
Default: `false`

#### DisableWebViewDrop

Disables the webview's drag and drop functionality.

It can be used to prevent accidental opening of dragged in files in the webview, when there is no need for drag and drop.

Name: DisableWebViewDrop<br/>
Type: `bool`<br/>
Default: `false`

#### CSSDropProperty

CSS property to test for drag and drop target elements.

Name: CSSDropProperty<br/>
Type: `string`<br/>
Default: `--wails-drop-target`

#### CSSDropValue

The CSS Value that the CSSDropProperty must have to be a valid drop target. Default "drop"

Name: CSSDropValue<br/>
Type: `string`<br/>
Default: `drop`

### Windows

This defines [Windows specific options](#windows).

Name: Windows<br/>
Type: `*windows.Options`

#### WebviewIsTransparent

Setting this to `true` will make the webview background transparent when an alpha value of `0` is used.
This means that if you use `rgba(0,0,0,0)` for `background-color` in your CSS, the host window will show through.
Often combined with [WindowIsTranslucent](#WindowIsTranslucent) to make frosty-looking applications.

Name: WebviewIsTransparent<br/>
Type: `bool`

#### WindowIsTranslucent

Setting this to `true` will make the window background translucent. Often combined
with [WebviewIsTransparent](#WebviewIsTransparent).

For Windows 11 versions before build 22621, this will use the [BlurBehind](https://learn.microsoft.com/en-us/windows/win32/dwm/blur-ovw)
method for translucency, which can be slow. For Windows 11 versions after build 22621, this will enable the
newer translucency types that are much faster. By default, the type of translucency used will be determined
by Windows. To configure this, use the [BackdropType](#BackdropType) option.

Name: WindowIsTranslucent<br/>
Type: `bool`

#### BackdropType

:::note

Requires Windows 11 build 22621 or later.

:::

Sets the translucency type of the window. This is only applicable if [WindowIsTranslucent](#WindowIsTranslucent) is set to `true`.

Name: BackdropType<br/>
Type `windows.BackdropType`

The value can be one of the following:

| Value   | Description                                                                               |
| ------- | ----------------------------------------------------------------------------------------- |
| Auto    | Let Windows decide which backdrop to use                                                  |
| None    | Do not use translucency                                                                   |
| Acrylic | Use [Acrylic](https://learn.microsoft.com/en-us/windows/apps/design/style/acrylic) effect |
| Mica    | Use [Mica](https://learn.microsoft.com/en-us/windows/apps/design/style/mica) effect       |
| Tabbed  | Use Tabbed. This is a backdrop that is similar to Mica.                                   |

#### ZoomFactor

Name: ZoomFactor<br/>
Type: `float64`

This defines the zoom factor for the WebView2. This is the option matching the Edge user activated zoom in or out.

#### IsZoomControlEnabled

Name: IsZoomControlEnabled<br/>
Type: `bool`

This enables the zoom factor to be changed by the user. Please note that the zoom factor can be set in the options while
disallowing the user to change it at runtime (f.e. for a kiosk application or similar).

#### DisablePinchZoom

Setting this to `true` will disable pinch zoom gestures.

Name: DisablePinchZoom<br/>
Type: `bool`

#### DisableWindowIcon

Setting this to `true` will remove the icon in the top left corner of the title bar.

Name: DisableWindowIcon<br/>
Type: `bool`

#### DisableFramelessWindowDecorations

Setting this to `true` will remove the window decorations in [Frameless](#Frameless) mode. This means there will be no
'Aero Shadow' and no 'Rounded Corners' shown for the window. Please note that 'Rounded Corners' are only supported on
Windows 11.

Name: DisableFramelessWindowDecorations<br/>
Type: `bool`

#### WebviewUserDataPath

This defines the path where the WebView2 stores the user data. If empty `%APPDATA%\[BinaryName.exe]` will be used.

Name: WebviewUserDataPath<br/>
Type: `string`

#### WebviewBrowserPath

This defines the path to a directory with WebView2 executable files and libraries. If empty, webview2 installed in the system will be used.

Important information about distribution of fixed version runtime:

- [How to get and extract runtime](https://docs.microsoft.com/en-us/microsoft-edge/webview2/concepts/distribution#details-about-the-fixed-version-runtime-distribution-mode)
- [Known issues for fixed version](https://docs.microsoft.com/en-us/microsoft-edge/webview2/concepts/distribution#known-issues-for-fixed-version)
- [The path of fixed version of the WebView2 Runtime should not contain \Edge\Application\.](https://docs.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/webview2-idl?view=webview2-1.0.1245.22#createcorewebview2environmentwithoptions)

Name: WebviewBrowserPath<br/>
Type: `string`

#### Theme

Minimum Windows Version: Windows 10 2004/20H1

This defines the theme that the application should use:

| Value         | Description                                                                                                                                   |
| ------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| SystemDefault | _Default_. The theme will be based on the system default. If the user changes their theme, the application will update to use the new setting |
| Dark          | The application will use a dark theme exclusively                                                                                             |
| Light         | The application will use a light theme exclusively                                                                                            |

Name: Theme<br/>
Type: `windows.Theme`

#### CustomTheme

:::note

Minimum Windows Version: Windows 10/11 2009/21H2 Build 22000

:::

Allows you to specify custom colours for TitleBar, TitleText and Border for both light and dark mode, as well as
when the window is active or inactive.

Name: CustomTheme<br/>
Type: `windows.CustomTheme`

##### CustomTheme type

The CustomTheme struct uses `int32` to specify the colour values. These are in the standard(!) Windows format of:
`0x00BBGGAA`. A helper function is provided to do RGB conversions into this format: `windows.RGB(r,g,b uint8)`.

NOTE: Any value not provided will default to black.

```go
type ThemeSettings struct {
	DarkModeTitleBar           int32
	DarkModeTitleBarInactive   int32
	DarkModeTitleText          int32
	DarkModeTitleTextInactive  int32
	DarkModeBorder             int32
	DarkModeBorderInactive     int32
	LightModeTitleBar          int32
	LightModeTitleBarInactive  int32
	LightModeTitleText         int32
	LightModeTitleTextInactive int32
	LightModeBorder            int32
	LightModeBorderInactive    int32
}
```

Example:

```go
    CustomTheme: &windows.ThemeSettings{
        // Theme to use when window is active
        DarkModeTitleBar:   windows.RGB(255, 0, 0),   // Red
        DarkModeTitleText:  windows.RGB(0, 255, 0),   // Green
        DarkModeBorder:     windows.RGB(0, 0, 255),   // Blue
        LightModeTitleBar:  windows.RGB(200, 200, 200),
        LightModeTitleText: windows.RGB(20, 20, 20),
        LightModeBorder:    windows.RGB(200, 200, 200),
        // Theme to use when window is inactive
        DarkModeTitleBarInactive:   windows.RGB(128, 0, 0),
        DarkModeTitleTextInactive:  windows.RGB(0, 128, 0),
        DarkModeBorderInactive:     windows.RGB(0, 0, 128),
        LightModeTitleBarInactive:  windows.RGB(100, 100, 100),
        LightModeTitleTextInactive: windows.RGB(10, 10, 10),
        LightModeBorderInactive:    windows.RGB(100, 100, 100),
    },
```

#### Messages

A struct of strings used by the webview2 installer if a valid webview2 runtime is not found.

Name: Messages<br/>
Type: `*windows.Messages`

Customise this for any language you choose to support.

#### ResizeDebounceMS

ResizeDebounceMS is the amount of time to debounce redraws of webview2 when resizing the window.
The default value (0) will perform redraws as fast as it can.

Name: ResizeDebounceMS<br/>
Type: `uint16`

#### OnSuspend

If set, this function will be called when Windows initiates a switch to low power mode (suspend/hibernate)

Name: OnSuspend<br/>
Type: `func()`

#### OnResume

If set, this function will be called when Windows resumes from low power mode (suspend/hibernate)

Name: OnResume<br/>
Type: `func()`

#### WebviewGpuIsDisabled

Setting this to `true` will disable GPU hardware acceleration for the webview.

Name: WebviewGpuIsDisabled<br/>
Type: `bool`

#### EnableSwipeGestures

Setting this to `true` will enable swipe gestures for the webview.

Name: EnableSwipeGestures<br/>
Type: `bool`

#### WindowClassName

Class name for the window. If empty, 'wailsWindow' will be used.

Name: WindowClassName<br/>
Type: `string`

### Mac

This defines [Mac specific options](#mac).

Name: Mac<br/>
Type: `*mac.Options`

#### TitleBar

The TitleBar struct provides the ability to configure the look and feel of the title bar.

Name: TitleBar<br/>
Type: [`*mac.TitleBar`](#titlebar-struct)

##### Titlebar struct

The titlebar of the application can be customised by using the TitleBar options:

```go
type TitleBar struct {
	TitlebarAppearsTransparent bool
	HideTitle                  bool
	HideTitleBar               bool
	FullSizeContent            bool
	UseToolbar                 bool
	HideToolbarSeparator       bool
}
```

| Name                       | Description                                                                                                                                                                                                                          |
| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| TitlebarAppearsTransparent | Makes the titlebar transparent. This has the effect of hiding the titlebar and the content fill the window. [Apple Docs](https://developer.apple.com/documentation/appkit/nswindow/1419167-titlebarappearstransparent?language=objc) |
| HideTitle                  | Hides the title of the window. [Apple Docs](https://developer.apple.com/documentation/appkit/nswindowtitlevisibility?language=objc)                                                                                                  |
| HideTitleBar               | Removes [NSWindowStyleMaskTitled](https://developer.apple.com/documentation/appkit/nswindowstylemask/nswindowstylemasktitled/) from the style mask                                                                                   |
| FullSizeContent            | Makes the webview fill the entire window. [Apple Docs](https://developer.apple.com/documentation/appkit/nswindowstylemask/nswindowstylemaskfullsizecontentview)                                                                      |
| UseToolbar                 | Adds a default toolbar to the window. [Apple Docs](https://developer.apple.com/documentation/appkit/nstoolbar?language=objc)                                                                                                         |
| HideToolbarSeparator       | Removes the line beneath the toolbar. [Apple Docs](https://developer.apple.com/documentation/appkit/nstoolbar/1516954-showsbaselineseparator?language=objc)                                                                          |

Preconfigured titlebar settings are available:

| Setting                     | Example                                        |
| --------------------------- | ---------------------------------------------- |
| `mac.TitleBarDefault()`     | ![](/img/reference/titlebar-default.webp)      |
| `mac.TitleBarHidden()`      | ![](/img/reference/titlebar-hidden.webp)       |
| `mac.TitleBarHiddenInset()` | ![](/img/reference/titlebar-hidden-inset.webp) |

Example:

```go
Mac: &mac.Options{
	TitleBar:     mac.TitleBarHiddenInset(),
}
```

Click [here](https://github.com/lukakerr/NSWindowStyles) for some inspiration on customising the titlebar.

#### Appearance

Appearance is used to set the style of your app in accordance with Apple's [NSAppearance](https://developer.apple.com/documentation/appkit/nsappearancename?language=objc) names.

Name: Appearance<br/>
Type: [`mac.AppearanceType`](#appearance-type)

##### Appearance type

You can specify the application's [appearance](https://developer.apple.com/documentation/appkit/nsappearance?language=objc).

| Value                                                 | Description                                                     |
| ----------------------------------------------------- | --------------------------------------------------------------- |
| DefaultAppearance                                     | DefaultAppearance uses the default system value                 |
| NSAppearanceNameAqua                                  | The standard light system appearance                            |
| NSAppearanceNameDarkAqua                              | The standard dark system appearance                             |
| NSAppearanceNameVibrantLight                          | The light vibrant appearance                                    |
| NSAppearanceNameAccessibilityHighContrastAqua         | A high-contrast version of the standard light system appearance |
| NSAppearanceNameAccessibilityHighContrastDarkAqua     | A high-contrast version of the standard dark system appearance  |
| NSAppearanceNameAccessibilityHighContrastVibrantLight | A high-contrast version of the light vibrant appearance         |
| NSAppearanceNameAccessibilityHighContrastVibrantDark  | A high-contrast version of the dark vibrant appearance          |

Example:

```go
Mac: &mac.Options{
    Appearance: mac.NSAppearanceNameDarkAqua,
}
```

#### WebviewIsTransparent

Setting this to `true` will make the webview background transparent when an alpha value of `0` is used.
This means that if you use `rgba(0,0,0,0)` for `background-color` in your CSS, the host window will show through.
Often combined with [WindowIsTranslucent](#WindowIsTranslucent) to make frosty-looking applications.

Name: WebviewIsTransparent<br/>
Type: `bool`

#### WindowIsTranslucent

Setting this to `true` will make the window background translucent. Often combined
with [WebviewIsTransparent](#WebviewIsTransparent) to make frosty-looking applications.

Name: WindowIsTranslucent<br/>
Type: `bool`

#### OnFileOpen

Callback that is called when a file is opened with the application.

Name: OnFileOpen<br/>
Type: `func(filePath string)`

#### OnUrlOpen

Callback that is called when a URL is opened with the application.

Name: OnUrlOpen<br/>
Type: `func(filePath string)`

#### Preferences

The Preferences struct provides the ability to configure the Webview preferences.

Name: Preferences<br/>
Type: [`*mac.Preferences`](#preferences-struct)

##### Preferences struct

You can specify the webview preferences.

```go
type Preferences struct {
	TabFocusesLinks        u.Bool
	TextInteractionEnabled u.Bool
	FullscreenEnabled      u.Bool
}
```

| Name                       | Description                                                                                                                                                                                                                          |
| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| TabFocusesLinks            | A Boolean value that indicates whether pressing the tab key changes the focus to links and form controls. [Apple Docs](https://developer.apple.com/documentation/webkit/wkpreferences/2818595-tabfocuseslinks?language=objc)         |
| TextInteractionEnabled     | A Boolean value that indicates whether to allow people to select or otherwise interact with text. [Apple Docs](https://developer.apple.com/documentation/webkit/wkpreferences/3727362-textinteractionenabled?language=objc)          |
| FullscreenEnabled          | A Boolean value that indicates whether a web view can display content full screen. [Apple Docs](https://developer.apple.com/documentation/webkit/wkpreferences/3917769-elementfullscreenenabled?language=objc)                       |

Example:

```go
Mac: &mac.Options{
    Preferences: &mac.Preferences{
		TabFocusesLinks:        mac.Enabled,
		TextInteractionEnabled: mac.Disabled,
		FullscreenEnabled:      mac.Enabled,
	}
}
```

#### About

This configuration lets you set the title, message and icon for the "About" menu item in the app menu created by the "AppMenu" role.

Name: About<br/>
Type: [`*mac.AboutInfo`](#about-struct)

##### About struct

```go

type AboutInfo struct {
	Title   string
	Message string
	Icon    []byte
}
```

If these settings are provided, an "About" menu item will appear in the app menu (when using the `AppMenu` role).
Given this configuration:

```go
//go:embed build/appicon.png
var icon []byte

func main() {
	err := wails.Run(&options.App{
	    ...
        Mac: &mac.Options{
            About: &mac.AboutInfo{
                Title:   "My Application",
                Message: "© 2021 Me",
                Icon:    icon,
            },
        },
    })
```

The "About" menu item will appear in the app menu:

```mdx-code-block
<div class="text--center">
  <img
    src={require("@site/static/img/reference/about-menu.webp").default}
    class="screenshot"
  />
</div>
<br />
```

When clicked, that will open an about message box:

```mdx-code-block
<div class="text--center">
  <img
    src={require("@site/static/img/reference/about-dialog.webp").default}
    width="40%"
    class="screenshot"
  />
</div>
<br />
```

### Linux

This defines [Linux specific options](#linux).

Name: Linux<br/>
Type: `*linux.Options`

#### Icon

Sets up the icon representing the window. This icon is used when the window is minimized (also known as iconified).

Name: Icon<br/>
Type: `[]byte`

Some window managers or desktop environments may also place it in the window frame, or display it in other contexts.
On others, the icon is not used at all, so your mileage may vary.

NOTE: Gnome on Wayland at least does not display this icon. To have a application icon there, a `.desktop` file has to be used.
On KDE it should work.

The icon should be provided in whatever size it was naturally drawn; that is, don’t scale the image before passing it.
Scaling is postponed until the last minute, when the desired final size is known, to allow best quality.

#### WindowIsTranslucent

Setting this to `true` will make the window background translucent. Some window managers may ignore it, or result in a black window.

Name: WindowIsTranslucent<br/>
Type: `bool`

#### WebviewGpuPolicy

This option is used for determining the webview's hardware acceleration policy.

Name: WebviewGpuPolicy<br/>
Type: [`options.WebviewGpuPolicy`](#webviewgpupolicy-type)<br/>
Default (Windows, macOS): `WebviewGpuPolicyAlways`<br/>
Default (Linux): Due to [#2977](https://github.com/wailsapp/wails/issues/2977,), if `options.Linux` is nil 
	    in the call to `wails.Run()`, `WebviewGpuPolicy` is set by default to `WebviewGpuPolicyNever`. You can override this behavior by passing a non-nil `Options` and set `WebviewGpuPolicy` as needed.


##### WebviewGpuPolicy type

| Value                    | Description |
| -------------------------| ----------- |
| WebviewGpuPolicyAlways   | Hardware acceleration is always enabled|
| WebviewGpuPolicyOnDemand | Hardware acceleration is enabled/disabled as request by web contents|
| WebviewGpuPolicyNever    | Hardware acceleration is always disabled |

#### ProgramName

This option is used to set the program's name for the window manager via GTK's g_set_prgname().
This name should not be localized, [see the docs](https://docs.gtk.org/glib/func.set_prgname.html).

When a .desktop file is created this value helps with window grouping and desktop icons when the .desktop file's `Name`
property differs form the executable's filename.

Name: ProgramName<br/>
Type: string<br/>

### Debug

This defines [Debug specific options](#Debug) that apply to debug builds.

Name: Debug<br/>
Type: `options.Debug`

#### OpenInspectorOnStartup

Setting this to `true` will open the WebInspector on startup of the application.

Name: OpenInspectorOnStartup<br/>
Type: `bool`
